EN 1.4988 Stainless Steel vs. S21640 Stainless Steel
Both EN 1.4988 stainless steel and S21640 stainless steel are iron alloys. They have a moderately high 91% of their average alloy composition in common.
For each property being compared, the top bar is EN 1.4988 stainless steel and the bottom bar is S21640 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 190 | |
| 230 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 34 | |
| 46 |
| Fatigue Strength, MPa | 230 | |
| 320 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 77 | |
| 78 |
| Shear Strength, MPa | 430 | |
| 520 |
| Tensile Strength: Ultimate (UTS), MPa | 640 | |
| 740 |
| Tensile Strength: Yield (Proof), MPa | 290 | |
| 350 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 290 |
| Maximum Temperature: Corrosion, °C | 520 | |
| 490 |
| Maximum Temperature: Mechanical, °C | 920 | |
| 940 |
| Melting Completion (Liquidus), °C | 1450 | |
| 1430 |
| Melting Onset (Solidus), °C | 1400 | |
| 1380 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 15 | |
| 15 |
| Thermal Expansion, µm/m-K | 16 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.2 | |
| 2.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.5 | |
| 2.8 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 23 | |
| 17 |
| Density, g/cm3 | 7.9 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 6.0 | |
| 3.6 |
| Embodied Energy, MJ/kg | 89 | |
| 51 |
| Embodied Water, L/kg | 150 | |
| 150 |
Common Calculations
| PREN (Pitting Resistance) | 22 | |
| 26 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 180 | |
| 280 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 210 | |
| 300 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 23 | |
| 27 |
| Strength to Weight: Bending, points | 21 | |
| 23 |
| Thermal Diffusivity, mm2/s | 4.0 | |
| 4.0 |
| Thermal Shock Resistance, points | 14 | |
| 16 |
Alloy Composition
| Carbon (C), % | 0.040 to 0.1 | |
| 0 to 0.080 |
| Chromium (Cr), % | 15.5 to 17.5 | |
| 17.5 to 19.5 |
| Iron (Fe), % | 62.1 to 69.5 | |
| 63 to 74.3 |
| Manganese (Mn), % | 0 to 1.5 | |
| 3.5 to 6.5 |
| Molybdenum (Mo), % | 1.1 to 1.5 | |
| 0.5 to 2.0 |
| Nickel (Ni), % | 12.5 to 14.5 | |
| 4.0 to 6.5 |
| Niobium (Nb), % | 0.4 to 1.2 | |
| 0.1 to 1.0 |
| Nitrogen (N), % | 0.060 to 0.14 | |
| 0.080 to 0.3 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.060 |
| Silicon (Si), % | 0.3 to 0.6 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.030 |
| Vanadium (V), % | 0.6 to 0.85 | |
| 0 |